This work was carried at the Rangipo Power Station which is located on the environmentally sensitive Tongariro river.

Challenges to be considered during this project were environment, time frame (Station/Dam shut was limited to 10 days) and a certain amount of uncertainty of what conditions might be encountered.

Work involved de-watering of the sluice gate stilling basin area, excavation to remove gravel and boulders and the control of the water throughout this operation. This was to allow the inspection of the damamged sluice gate/baffle area to take place.

Work was completed on time and without any contingency measures being implemented.